How much moss killer do I need? Working it out by area
The short version
One 10L commercial concentrate makes up to 110 litres of ready-to-use spray at 1:10, and covers 600 square metres or more on a first treatment.
At 1:20 as a maintenance spray, the same bottle covers over 1,200 square metres.
That works out at roughly 26 cents per square metre.
Working out your area
Pace it or measure it, length times width, and add the sections together. Round up — running short halfway across a car park on a still Saturday is the one thing you do not want.
| Area to treat | What to order |
|---|---|
| Up to 150m² — a house roof, a drive | Domestic 5L, or Swift Applicator 2L for spot work |
| Up to 600m² — a large drive, courts, a block of paths | Commercial 10L |
| Up to 1,200m² | Commercial 20L |
| 1,200m² and up — a school, a village, a campus | Multiple 20L, and ask about the trailer |
Roofs are the one people underestimate. Measure the footprint and add for pitch, or send us the address and we will work it off an aerial.
The sizes
- Commercial 10L — $159. 198 g/L, double strength. Makes 110L.
- Commercial 20L — $299. The same concentrate, twice the volume, and better value per litre.
- Domestic 5L — $59. 99 g/L, mixed for everyday use around the house.
- Swift Applicator 2L — $59. Applicator built in, covers up to 300m². Spot work and touch-ups.
Buying more than a couple
Volume discounts start at 10 bottles. If you run several sites, the discount applies across the group rather than per order — a site ordering two sits on the same rate as a site ordering ten.
Orders of 60 litres or more get the application trailer free. It mixes 220 litres in one go and carries 100 metres of hose, so a large site is done from one or two set-ups instead of constant refilling.
Frequently asked questions
How many square metres does 10 litres cover?
600 square metres or more at 1:10 for a first treatment, and over 1,200 square metres at 1:20 as a maintenance spray.
How much does it cost per square metre?
Roughly 26 cents per square metre at the 1:10 first-treatment rate.
How much do I need for a house roof?
Most single-storey house roofs sit under 150m², so a Domestic 5L usually covers it. Measure the footprint and allow extra for pitch.
What is the difference between the 10L and the 20L?
Nothing but volume. Same concentrate, same strength. The 20L works out cheaper per litre.
Can you tell me what to order if I give you the area?
Yes. Call 021 466 060 with a rough square metre figure, or the address, and we will tell you what to order.
See also how to mix and apply it and buying for a school or multi-site group.
Free shipping on orders over $100 · Call 021 466 060.
